| pigmented hair epidermal nevus | A nevus first seen as an irregular pigmentation of the shoulders, upper chest, or scapular area, gradually enlarging irregularly and becoming thickened and hairy. Synonym: pigmented hair epidermal nevus. (05 Mar 2000) |
|---|---|
| giant hairy nevus | <dermatology> These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. (17 Dec 1997) |
| linear epidermal nevus | A congenital systematised linear nevus limited to one side of the body or to portions of the extremities on one side; lesions are often extensive, forming wave-like bands on the trunk and spiraling streaks on the extremities. Synonym: linear epidermal nevus. (05 Mar 2000) |
| giant pigmented nevus | These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. (27 Sep 1997) |
| congenital giant pigmented nevus | These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. (27 Sep 1997) |
| nevus, pigmented | A nevus containing melanin. The term is usually restricted to nevocytic nevi (round or oval collections of melanin-containing nevus cells occurring at the dermoepidermal junction of the skin or in the dermis proper) or moles, but may be applied to other pigmented nevi. (12 Dec 1998) |
| receptors, epidermal growth factor-urogastrone | Glycoproteins of about 170 kD that have protein kinase activity and span the plasma membranes of growing cells, including tumours. They are activated by the binding of epidermal growth factor-urogastrone which then initiates DNA and protein synthesis. They are not found on mitotically quiescent cells except in the stomach where they control the synthesis and release of digestive enzymes and gastric acid. Transforming growth factor alpha also binds to and activates these receptors. (12 Dec 1998) |
| hairy | A pair rule gene of Drosophila. (18 Nov 1997) |
| hairy cell leukaemia | <haematology, oncology> A rare chronic disorder characterised by proliferation of hairy cells in reticuloendothelial organs and blood. Origin: Gr. Haima = blood (13 Nov 1997) |
| hairy cells | Medium sized leukocytes that have features of reticuloendothelial cell's and multiple cytoplasmic projections (hairs) on the cell surface, but which may be a variety of B lymphocyte; they are found in hairy cell leukaemia. (05 Mar 2000) |
| hairy heart | Acute pericarditis with fibrinous exudate. See: bread-and-butter pericardium. Synonym: hairy heart, pericarditis villosa, shaggy pericardium. (05 Mar 2000) |
| hairy leukoplakia | <dermatology, gastroenterology> A white lesion appearing on the tongue, occasionally on the buccal mucosa, of patients with AIDS, the lesion appears raised, with a corrugated or hairy surface due to keratin projections. (13 Nov 1997) |
| hairy mole | A mole covered with an abundant growth of hair. Synonym: hairy mole. (05 Mar 2000) |
| hairy root culture | A relatively new type of plant culture, which consists of highly branched roots of a plant, covered with a mass of tiny root hairs. These cultures do not require hormones or vitamins to grow, so they can grow on simple media of salts and sugars. Just as importantly, they produce secondary metabolites at levels similar to those made in the original plant, so they can be used as replacement plants for making such compounds as food flavours and fragrances. (14 Nov 1997) |
| hairy shaker disease | Congenital disorder of lambs caused by a virus closely related to or identical with certain strains of bovine viral diarrhoea virus. (12 Dec 1998) |